<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>风车</title>
		<link rel="stylesheet" type="text/css" href="css/reset-min.css"/>
		<style type="text/css">
			/* 禁掉系统滚动条 */
			html,body{
				height: 100%;
				overflow: hidden;
			}
			.wrap{
				width: 300px;
				height: 300px;
				/* 居中 */
				position: absolute;
				left: 0;
				right: 0;
				top: 0;
				bottom: 0;
				margin: auto;
				transition: 2s;
			}
			.wrap > div{
				margin: 10px;
				width: 130px;
				height: 130px;
				background: pink;
				float: left;
				box-sizing: border-box;
			}
			.wrap > div:nth-child(1),
			.wrap > div:nth-child(4){
				border-radius: 0 60%;
			}
			.wrap > div:nth-child(2),
			.wrap > div:nth-child(3){
				border-radius: 60% 0;
			}
			.wrap:hover{
				transform: rotate(360deg);
			}
		</style>
	</head>
	<body>
		<div class="wrap">
			<div></div>
			<div></div>
			<div></div>
			<div></div>
		</div>
	</body>
</html>
